Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6ffa1056f67e89…

MALICIOUS

PDF

81.9 KB Created: 2021-08-18 08:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9ff4f873e6db385cfbdeda5937495f3 SHA-1: b6a08e6acca17c19db9537e79ff01e86511233b7 SHA-256: 1b6ffa1056f67e89f43617f79d3d0d2b3694305d918a280f66a3968c77684779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. This is likely intended to direct users to malicious websites for phishing or malware downloads. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=costco+eggplant+parmesan+cooking+instructions PDF link annotation
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9068887998db05a4eee1dc0999e58deb/xewukelalunorawufugisa.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/76058291628.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/wofofirovatodivimabowomu.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/lufivo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2601b9991---81232140528.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210526174320.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7be222b0c2ad2a115040c9f928011f7a/wadeselatefakisozi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077637f23036---lomumeveda.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3211a433---kekotovafitinivuluz.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/73025578447.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8858edddf1---dirofumobawutaxabez.pdfIn PDF document text
    • https://petikdaun.com/contents//files/75310793425.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/53602643758.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/2a204cf5b29687e0d846eeba969277b6/baxotixiri.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/35509066156.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d584ed4---rebukusexevevovakegejapat.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607884efb9d9d---96238065089.pdfIn PDF document text
    • http://ccsl.asia/files/37083638596.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/41230372815.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1cc84c9ee27a21b4dc37d41845c02239/gasobewujadofenebaf.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92374cec2c---mugefi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1905d6da---84595872245.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/38179454131.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 17772 bytes
SHA-256: 3d6d14da332121c95248b8b733646bd27ffdf811b69083060e1113d86fd6cbec
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 10940 bytes
SHA-256: 3d287839627d5979db7ec4cefd6861a387f31e8003c0759ef7cde886957bd70e

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